EPROM

EPROM stands for erasable programmable read-only memory, and is a type of solid state memory chip. EPROM is a type of non-volatile ROM memory which retains data after the power has been switched off. EPROM ICs are used within circuits to add memory capabilities.

The basic transistor device in an EPROM chip is different from the normal MOS transistor. A floating gate avalanche injection MOS transistor is used. There are two gates to this MOS transistor and one gate is a floating gate, meaning that it has no electrical connection to that gate.

EPROM varies from other types of programmable ROM memory as, when you erase data, the entire memory is removed. EEPROM is another memory chip with erasable data. However, it can erase blocks of data instead.

Where are EPROM chips used?

  • Computer memory
  • Compact flash
  • USB sticks
  • Microcontrollers

How is EPROM memory erased?

EPROM ICs can be programmed and then erased by using a UV light. They feature a transparent quartz window on top of the package. The memory in an EPROM device is erased by applying UV light to the window at the top of the package. General indoor lighting will not contain enough UV light to effect it. However, outdoor light could cause memory to be erased. Therefore many chip windows are protected and covered by a label.

Once the chip is exposed to UV light, the electrons in the floating gate get excited. The high energy that they acquire allows them to overcome the silicon dioxide barrier and move over to the silicon substrate or the control gate. Once they do this you are reducing the threshold voltage. This can take up to 30 minutes, after which the electrons move out from the floating gate and then it is ready for reprogramming.


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Omschrijving Prijs Memory Size Organisation Interface Type Maximum Random Access Time Programming Voltage Reprogramming Technique In System Programmability Mounting Type Package Type Pin Count Dimensions Maximum Operating Supply Voltage Maximum Operating Temperature Minimum Operating Supply Voltage
RS-stocknr. 127-6556
FabrikantnummerAT27C256R-45JU
FabrikantMicrochip
€ 1,676
Each (In a Pack of 5)
Aantal stuks
256kbit 32K x 8 bit - 45ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
RS-stocknr. 127-4048
FabrikantnummerAT27C010-70JU
FabrikantMicrochip
€ 2,242
Each (In a Pack of 5)
Aantal stuks
1Mbit 128K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
RS-stocknr. 177-1739
FabrikantnummerAT27LV010A-70JU
FabrikantMicrochip
€ 2,112
Each (In a Pack of 5)
Aantal stuks
1Mbit 128K x 8 bit Parallel 70ns - OTP - Surface Mount PLCC 32 14.04 x 11.5 x 3.17mm 3.6 (Low Voltage) V, 5 (Standard) V +85 °C 3 (Low Voltage) V
RS-stocknr. 146-1071
FabrikantnummerDS2502P+
FabrikantMaxim Integrated
€ 1,67
Each (In a Tube of 120)
Aantal stuks
1kbit - - - - - - Surface Mount TSOC 6 4 x 3.89 x 1.5mm - +85 °C -
RS-stocknr. 192-1255
FabrikantnummerDS2502S+
FabrikantMaxim Integrated
€ 1,762
Each (In a Tube of 100)
Aantal stuks
1kbit 1K x 1 bit 1-Wire 120µs 11.5V OTP In System Surface Mount SOIC 8 5 x 4 x 1.5mm 6 V +85 °C 2.8 V
RS-stocknr. 190-6082
FabrikantnummerDS2502R+T&R
FabrikantMaxim Integrated
€ 1,057
Each (On a Reel of 3000)
Aantal stuks
1kbit - 1-Wire - 12 V @ 10 mA - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 6 V +85 °C 2.8 V
RS-stocknr. 127-4062
FabrikantnummerAT27C020-90PU
FabrikantMicrochip
€ 2,97
Each (In a Pack of 2)
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 127-6560
FabrikantnummerAT27C4096-55JU
FabrikantMicrochip
€ 5,83
Each
Aantal stuks
4Mbit 256K x 16 bit - 55ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm - +85 °C -
RS-stocknr. 192-1512
FabrikantnummerDS2502S+
FabrikantMaxim Integrated
€ 2,232
Each (In a Pack of 5)
Aantal stuks
1kbit 1K x 1 bit 1-Wire 120µs 11.5V OTP In System Surface Mount SOIC 8 5 x 4 x 1.5mm 6 V +85 °C 2.8 V
RS-stocknr. 137-519
FabrikantnummerDS1982-F3+
FabrikantMaxim Integrated
€ 2,87
Each
Aantal stuks
1kbit - - - - - - - F3 MicroCan 2 17.36 (Dia.) x 3.1mm - +85 °C -
RS-stocknr. 127-6562
FabrikantnummerAT27C4096-90PU
FabrikantMicrochip
€ 5,89
Each
Aantal stuks
4Mbit 256K x 16 bit - 90ns - OTP - Through Hole PDIP 40 52.57 x 13.97 x 4.44mm - +85 °C -
RS-stocknr. 127-4058
FabrikantnummerAT27C020-55PU
FabrikantMicrochip
€ 2,995
Each (In a Pack of 2)
Aantal stuks
2Mbit 256K x 8 bit - 55ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - +85 °C -
RS-stocknr. 127-6554
FabrikantnummerAT27C1024-70PU
FabrikantMicrochip
€ 2,965
Each (In a Pack of 2)
Aantal stuks
1Mbit 64K x 16 bit - 70ns - OTP - Through Hole PDIP 40 52.57 x 13.97 x 4.44mm - +85 °C -
RS-stocknr. 127-6547
FabrikantnummerAT27C040-90JU
FabrikantMicrochip
€ 4,095
Each (In a Pack of 2)
Aantal stuks
4Mbit 512K x 8 bit - 90ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
RS-stocknr. 127-6552
FabrikantnummerAT27C1024-45PU
FabrikantMicrochip
€ 3,015
Each (In a Pack of 2)
Aantal stuks
1Mbit 64K x 16 bit - 45ns - OTP - Through Hole PDIP 40 52.57 x 13.97 x 4.44mm - +85 °C -
RS-stocknr. 127-6561
FabrikantnummerAT27C4096-90JU
FabrikantMicrochip
€ 5,75
Each
Aantal stuks
4Mbit 256K x 16 bit - 90ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm - +85 °C -
RS-stocknr. 190-6989
FabrikantnummerDS2502R+T&R
FabrikantMaxim Integrated
€ 1,684
Each (In a Pack of 5)
Aantal stuks
1kbit - 1-Wire - 12 V @ 10 mA - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 6 V +85 °C 2.8 V
RS-stocknr. 127-4051
FabrikantnummerAT27C020-55JU
FabrikantMicrochip
€ 2,855
Each (In a Pack of 2)
Aantal stuks
2Mbit 256K x 8 bit - 55ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
RS-stocknr. 190-6081
FabrikantnummerDS2502P-E48+T&R
FabrikantMaxim Integrated
€ 1,621
Each (On a Reel of 4000)
Aantal stuks
1024bit - 1-Wire - - OTP - Surface Mount TSOC 6 4 x 3.89 x 1.34mm 6 V +85 °C 2.8 V
RS-stocknr. 127-6558
FabrikantnummerAT27C256R-70JU
FabrikantMicrochip
€ 1,632
Each (In a Pack of 5)
Aantal stuks
256kbit 32K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -